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wcelectric
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Homework Statement
Two capacitors are connected in parallel to a battery with voltage of 28V. Let [tex]C_1 = 9.0 \mu F[/tex] and [tex]C_2 = 4.0 \mu F [/tex].
Suppose the charged capacitors are disconnected from the source and from each other, and then reconnected to each other with plates of opposite signs together. By how much does the energy of the system decrease?
Homework Equations
[tex]u=\frac{1}{2}CV^2[/tex]
[tex]C=\frac{Q}{V}[/tex]
The Attempt at a Solution
I have [tex]Q_1 = 252 \mu C[/tex] and [tex]Q_2 = 112 \mu C[/tex]. Beyond that I'm stuck.